OptionMonster co-founder Pete Najarian provides options picks Monday, Wednesday and Friday in TheStreet.com's Deep in the Money Calls newsletter.

David Russell, reporter for OptionMonster.

A large options trader apparently thinks Comcast ( CMCSK) is heading higher.

OptionMonster's tracking systems detected heavy buying of the Aug. 15 calls yesterday for $0.20 and $0.25. In just half an hour, the strike traded 10,098 times against open interest of 681 contracts. Another 1,357 contracts changed hands in the strike for the rest of the session.

Comcast rose 0.4% to $13.66 yesterday and is up 3.1% in the past month, compared with an 9.1% gain for the S&P 500. The call buyer may be betting on strong results when the cable company reports second-quarter earnings before the bell Aug. 6.

Alternatively, the trade may have resulted from an investor buying calls and selling the shares as part of a so-called delta-neutral strategy that would benefit from increased movement in the shares.

Options volume in Comcast was more than eight times average yesterday, with calls outnumbering puts by 75 to 1.

The writer has no holdings in the securities mentioned.